Ay, madalas talaga yan sa pregnancy, lalo na pag tumaas ang progesterone mo, a few of us moms noticed ang same thing, especially sa first at third trimester. But kung sobra na or may blood, or parang may cramping pa, mas safe na i-check with your OB agad kasi sometimes may underlying cause na kailangan addressing, lalo na kung bagong baguhan lang ang symptoms na yan.